Mercurial > hg > CbC > CbC_gcc
view libgo/go/runtime/os_linux_arm64.go @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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// Copyright 2015 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build arm64 package runtime import "internal/cpu" func archauxv(tag, val uintptr) { switch tag { case _AT_HWCAP: // arm64 doesn't have a 'cpuid' instruction equivalent and relies on // HWCAP/HWCAP2 bits for hardware capabilities. hwcap := uint(val) if GOOS == "android" { // The Samsung S9+ kernel reports support for atomics, but not all cores // actually support them, resulting in SIGILL. See issue #28431. // TODO(elias.naur): Only disable the optimization on bad chipsets. const hwcap_ATOMICS = 1 << 8 hwcap &= ^uint(hwcap_ATOMICS) } cpu.HWCap = hwcap case _AT_HWCAP2: cpu.HWCap2 = uint(val) } }